This Master Flow 10-inch x 10-inch to 8-inch Register Box (Model RB10X10X8)Go to product viewer dialog for this item. is designed to transition ductwork to a register or grille. Made of galvanized steel for durability, this box is suitable for HVAC applications. Features a 10 inch x 10 inch top opening and an 8 inch collar connection. Condition is listed as salvage

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